Trinity error, how can I fix this?

[Turtleking]

Loading Transport templates...

/opt/TrinityCore3/src/server/game/Maps/TransportMgr.cpp:137 in GeneratePath ASSERTION FAILED:
!keyFrames.empty()
./worldserver(_ZN12TransportMgr22LoadTransportTemplatesEv+0x559) [0xd005a9]
./worldserver(_ZN5World23SetInitialWorldSettingsEv+0xd01) [0xe41101]
./worldserver(_ZN6Master3RunEv+0xb3f) [0x9c6daf]
./worldserver(main+0x205) [0x9a2d45]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xfd) [0x7fd5f92aeead]
./worldserver() [0x9b1f7d]

that's the error, I am unsure how to fix this....
a default unedited trinity core did the same thing.




basically we are trying to remove the graveyard entirely cause of our custom maps, but when we truncated it, it gave us this. We obviously cant remove the entire graveyard table or it would give an error saying there is none.
what can we do?